AZ31镁合金高温热压缩流变应力行为的研究  被引量:3

Flow stress behavior of AZ31 magnesium alloy during hot compression deformation at elevated temperature

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作  者:徐静[1] 戚文军[1] 黄正华[1] 周楠[1] 

机构地区:[1]广东省工业技术研究院(广州有色金属研究院),广东广州510650

出  处:《材料研究与应用》2013年第1期21-24,共4页Materials Research and Application

基  金:广东省重大科技专项(2011A080403005);广州有色金属研究院青年基金(2011B2009)

摘  要:在Gleeble 1500D型热模拟试验机上,在应变速率为0.01~1s-1、变形温度为573~723K条件下,对AZ31合金的流变应力行为进行了研究.结果表明:AZ31镁合金在热压缩变形时,当应变速率一定时,流变应力随着变形温度的升高而减小;而当变形温度一定时,流变应力随着应变速率的增大而增大;该合金的热压缩流变应力行为可用双曲正弦形式的本构方程来描述,在本实验条件下AZ31镁合金热变形应力指数n=8.34,其热变形激活能Q=196kJ/mol.Hot compression tests of AZ31 magnesium alloy were performed on Gleeble 1500 at strain rates ranging between 0.01-1 s-1 and deformation temperature 573-723 K. The results show that the flow stress increases with the increasing strain rate at the constant temperature, and the flow stress decreases with the increasing deformation temperature at the constant strain rate during the hot compression deformation of AZ31-1Sm magnesium alloy. It indicates that during the hot compression, the peak value of flow stress of this alloy could be depicted by the hyperbolic-sine mathematical model preferably. The hot deformation activation energy Q derived from the experimental dates is 196 kJ/mol with stress exponent n:8.34.

关 键 词:AZ31-1Sm镁合金 热压缩变形 流变应力 热变形激活能 

分 类 号:TG146.2[一般工业技术—材料科学与工程]

 

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